Identifying plant root structure via tissue distribution

Steps:

• Examine the photomicrograph for vascular tissue placement, focusing on xylem location relative to the organ's center.
• Compare to standard plant anatomy: roots have central xylem in the stele, while stems have peripheral bundles.
• Rule out stem features like scattered vascular tissue or epidermal hairs.
• Confirm root-specific traits, such as endodermis encircling the vascular core, not the outer edge.

Why C is correct:

• In dicot roots, xylem occupies the central stele as defined by vascular cylinder anatomy, appearing densest at the core.

Why the others are wrong:

• A: Central region contains vascular tissue (xylem/phloem), not supporting sclerenchyma.
• B: Trichomes occur on aerial stems, not root epidermis, which lacks extensions.
• D: Endodermis surrounds the stele internally, not the organ's outer edge.

Final answer: C